Stackable chair with squared back



FIG. 1 is a perspective view of the design taken from above and showing the right side thereof;

FIG. 2 is a front view of the design;

FIG. 3 is a back view of the design;

FIG. 4 is a top view of the design; and,

FIG. 5 is a right side view of the design, the left side view being the mirror image of the right side. 

The ornamental design for stackable chair with squared back, as shown and described. 